'Update data only if the letter is not in front

My Data:

TAn
Ants
TAr
Arm
TogA


UPDATE sample SET sample_data = REPLACE(sample_data , 'A', 'a');

The above shows my data and the SQL code i am using to change A to a. However i only want to change A to a on if A is not the first letter. How can i accomplish this in MySQL?



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